This paper proposes a new two-way double-relay selection strategy for wireless cooperative communication systems with its bit error rate (BER) performance analysis. In this work, two relays are first chosen to maximiz...
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This paper proposes a new two-way double-relay selection strategy for wireless cooperative communication systems with its bit error rate (BER) performance analysis. In this work, two relays are first chosen to maximize the overall system performance in terms of BER. Then, either the two-phase or three-phase protocol is performed to achieve two-directional communications between the communicating terminals through the selected relay nodes that apply orthogonal space-timecoding (STC) scheme in a distributed fashion to improve the overall system performance with linear decoding complexity. In other words, the proposed strategy offers an improvement in the reliability of the system and enjoys very low decoding complexity by enabling a symbol-wise decoder. On the other hand, another improvement in the performance at the communication terminals is achieved by performing a network coding method at the selected relay nodes. Furthermore, we offer also analytical approximation of the BER performance for the proposed strategy where the simulation results match perfectly the analytical ones. From the simulation results section, the proposed strategy shows a substantially improved BER performance as compared to the current ones.
This paper investigates the error performance of the amplify-and-forward (AF) relaying systems in the context of full-duplex (FD) communication. In addition to the inherent self-interference (SI) due to simultaneous t...
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This paper investigates the error performance of the amplify-and-forward (AF) relaying systems in the context of full-duplex (FD) communication. In addition to the inherent self-interference (SI) due to simultaneous transmission and reception, coexistent FD terminals may cause crosstalk. In this paper, we utilize the information exchange via the crosstalk channel to construct a particular distributedspace-time code (DSTC). The residual SI is also considered. Closed-form pairwise error probability (PEP) is first derived. Then we obtain the upper bound of PEP in high transmit power region to provide more insights of diversity and coding gain. The proposed DSTC scheme can attain full cooperative diversity if the variance of SI is not a function of the transmit power. The coding gain can be improved by lengthening the frame and proper power control. Feasibility and efficiency of the proposed DSTC are verified in numerical simulations.
In this paper, we propose a novel decode-and-forward dual-relay selection technique based on Alamouti spacetimecoding for twoway wireless relay networks (TWRNs). The two- and the threephase TWRN protocol are used in...
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In this paper, we propose a novel decode-and-forward dual-relay selection technique based on Alamouti spacetimecoding for twoway wireless relay networks (TWRNs). The two- and the threephase TWRN protocol are used in the first and second version of the proposed technique, respectively, to exchange the information symbols of the communicating terminals. In order not to waste any power for transmitting information symbols known at any terminal and hence to improve the achievable coding gain, the proposed technique uses the concept of digital network coding in which the transmitted symbols of both terminals are combined at the relays into a symbol of the same constellation. To further improve the reliability of the communication and offer additional coding gain, Alamouti spacetimecoding is incorporated in our technique. Simulation results show a substantially improved bit error rate (BER) performance of the proposed techniques as compared to the the state-of-the art techniques.
This paper considers a cooperative communications system consisting of a source, a relay and a destination and using the amplify-and-forward protocol. In the first time phase, the source node radiates data to both the...
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ISBN:
(纸本)9781467300087
This paper considers a cooperative communications system consisting of a source, a relay and a destination and using the amplify-and-forward protocol. In the first time phase, the source node radiates data to both the relay and the destination nodes. In the second time phase, however, the relay node and the source node transmit cooperatively to build up a distributed space-time coding scheme. For such a system with independent Rayleigh fading in each link, we obtain its exact BER performance in a one-integral form which can be numerically calculated. The analytic results match accurately with simulation results in various channel conditions.
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